Poly(arylene ether ketimine) gas separation membranes

A process of separating gases comprising:

• A. contacting one side of a semi-permeable gas separation membrane with a feed gas mixture under pressure, wherein the membrane separates a higher pressure region on one side of the membrane into which the feed gas mixture is fed from a lower pressure region on the other side of ht membrane;
• B. maintaining a pressure differential across the membrane under conditions such that at least one gaseous component in the feed gas mixture selectively permeates through the membrane from the higher pressure region to the lower pressure region;
• C. removing from the lower pressure region permeated gas which is enriched in the selectively permeating gaseous component(s);
• and
• D. removing form the higher pressure region non-permeated gas which is depleted in the selectively permeating gaseous component(s);
• wherein the membrane comprises a thin discriminating layer of a poly(arylene ether ketimine).